Means for removing and replacing wrist-pin bushings.



F. c. JONES. MEANS FOR REMOVING AND REP LAClNG WRSST' PIN BUSH|NGS\ Patent d 0015. 1, 1918..

2 SHEETSSHEET I.

FKHN K F. moms. MEANS.FOR REMOVlNG AND REPLACING WRlST PIN BUSHINGS.

APPLICATION FILED APR. 2!, I91?- RENEWED FEB-25.1918.

?atented 0st. 1, 1918.

2 SHEETS-SHEET 2.

v avmn'mhn FKHN K C. JONELE;

FRANK C. JQNES, OF TOLEDG, IOWA;

MEANS FOR REMOVING AND REPLACING vlnrsrerrn ncentives.

memes.

Application filed April 21, 1917, Serial No. 163,675.

i To all whom it may concern:

Be it. known that I, FRANK C. Jones, a citizen of the United States, residing at Toledo,'in the county of Tania and State of Iowa, have invented certain new and useful improvements in Means for Removing and Replacing Wrist-Pin Bushings, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to means for forcing out and replacing bushings, and particularly to means for forcing out old or-worn bushings from hollow pistons and replacing said bushings. v e

The general object of the invention is to provide a very simple, easily operated device of the character described, whereby the wrist; pin bushings ma. be forced out and new bushings forced in, without deforming or in any way distorting the piston.

A further object of the invention is to provide a screw press for this purpose, and still another object is to provide means for supportii'lg the. wall of the piston against deformation, due to the pressure exerted in forcing in the new bushing and in this connection to provide a piston support formed of two sections, with means for expanding the sections against the annular hubs which extend inward and which surround the bushings, thus supporting: the piston against (lOfOlfll'ltttlOIl.

Other objects will appear in the course of the following description.

My invention is'illustrated in the accompanying drawings, wherein Figure 1 is a side elevation of my device showing it in use in forcing out an old bushing, the piston and bushing being shown in section. v

Fig; 2 is a sectional view on the line 2--2 of Fig. 1 showing, the device applied to the forcing in of a new bushing.

Fig. 3 is a perspective view of the extension piece.

"Fig.4 is a perspective view of the head 20.

Fig. 5 is a perspective view of one of the expanding blocks.

Fig. 6 is a perspective view of both expanding blocks looking at the inner faces thereof. v

Referring to thesedrawings, it 'will be seen that my device comprises a bed 10, which is formed upon its upper face with wall of the Specification of Letters iatcnt.

Patented trot. 1, 191$. Renewed February 25, 1918. Eerie] No. 219,152.

curvature of a piston. Below this" seat, the

bed cut awav as at 1:2 and extending through the bed from the seat 11 to the cut away portion 12 is an opening" 13. which is greater in diameter than the diameter of the bushings to be inserted. Extending upward from the bed 10 and arching over the bed is a yoke '1 1. which may be of any suitable construction, but which is shown as being U-shaped in form and having the lower ends of its arms integrally connected or formed with the bed 10, the bed 10 and the yoke 14 being cast in one piece. At the upper end of theyoke the yoke is formed with n verti: cally extending screw-threaded passage 15, which is in exact alinen'icnt with the opening 13. i Operating within the screw-tln'e-aded passage 15 is a PICSSQIISCIGW 16, whose lower end is reduced as at 17, this reduced lower end being round in cross section. The upper end of the screw 16 is formed with a head 18, through which passes the handle 19. Designed to operate in conjunction with the presser screw 16 is a head 20, whose lower end is reduced in diameter, as at 21, so as to fit within a bushing", while its upper end is formedwith a socket 22 having av diameter equal to the diameter of the reduced portion 17 of the screw 16. Also used in conjunction with the screw 16 and the head 20 an extension piece 23, which is formed at. its upper end, with a socket 24 whose diameter is equal to the diameter of the reduced portion 17 of the screw 16 and which, at its lower end, is reduced in diameter as at 25 to fit within the socket of the head 20. In actual use this extension piece 23 ,will be about four inches long, more or less.

Also used in conjunction with the elements heretofore described and for the purpose of supporting the wall of the piston against deformation due to pressure applied thereto, is a supportimc block formed in two sections 26 and 27. Each. of these sections is formed with a central recess 28 upon its outer face. Each section is also formed with a dowel pin 29 upon its inner face and opposite the dowel pin with a mortise 30 to receive the corresponding pin on the opposite section. The confronting faces of the two sections are each formed with a tapering screwthreaded approximately semi-circular ilti till

lower busl.

recess 31 extending}; diametrically across the sections, and coat-tine; with the sections is a tapered screw 32 having a shank 33 and a handle til. It will be seen, that when the tapered screw" 32 is ll'lSBlliQtl in the screwthreaded recess 31 in the sections, the sections being "'orced against each other, that a rotation oi the cw in one direction will cause the sections to el zpand.

The operation of removing bushings from pistons is attended with considerable diiliculty, for the reason that the bushings are very tightly engaged with the inwardly extending hubs of the piston and. the pressure exerted upon the busings in the attempt to hammer the bushings out is very liable to deform the whole of the piston. l urthermore, in insertiiur new bushingggs there is liability oi over i ning the bushings or deforming them. y machine is designed to avoid this and pcrn'iit oi? the ready removal and ready replacement of he busl1ings,without any chance of deiorining either the pistons or the bushing itselit.

e In order to remove old bushings from a piston. the piston. is placed upon the seat 11 in the position illustrated in i iig. 1, with the hubsYr ding verticaliyand with the i ng; posed directly over the opening 13. The head t lt) then disposed within the piston with its reduced end 21 dispoi d within the l'lushing l3, the shoulder 21 resting; upon the upper more or" the bushing. The extension piece '23 then passed downward tin lithe upper bushing and into one a witlr tne upper end of the head 20. 3.6 is then turned until its reduced end 1! engages in the socket 24 in the upper end of the eutension piece 23 and then the screw is further turned, the lower bushing will be forced out of its corresponding huh. "il hen the lower bush- 1119; ll has been removed, the piston is reversed upon the bed so that the hub, from -which the bushing has been removed, is

uppermost and the operation is repeated for the second bushing.

When it is die ed to replace the bushings, the supporting member, composed of the sections and. is inserted within the piston with its recesses 28 in alinementwvith the hubs, and then the screw 32 is screwed inward until the sections 96 and 27 are expanded. firmly against the inner ends of the hubs 1B in the position shown in Fig. 2. Thus the wall oi the piston is fully supported against any deformation. The new bush- I ing B is then disposed at the entrance of the uppermost hub and the head is disposed upon this bushing. The screw 16 then screwed downward against the head 20 and this screwii'ip" action torces the head 90 down the bust" into place uulinp; huh. v Vhen the it c and beari up; against supported against any possible depression or deformation by the expanded blocks 26 and 27. With this device it is a very easy matter to remove the bushings of wrist pins and replace these bushings. It is also obvious that the device may be used for the purpose of initially inserting new bushings into pistons.

While I have illustrated a particular formof my invention, which I have found in practice to be very efi'ective, I wish it under stood that the device may be modified in many respects without departing from the scope of the appended claims. It will be seen that the member 16 constitutes a presser or plunger and that it may be forced downward toward the bed by any suitable means which will be cflbctive in forcing out the bushing. lit will further be seen that While I have shown a particular form of means for supporting the piston wall against deformation when a bushing is being inserted that this means might be modified in many respects.

Having thus described my invention, what I claim is 1. A device of the character described comprising a bed for supporting a piston, meansadapted to be' disposedwithin the pis= ton for supporting it against deformation, and meansmounted above the bed for forcing a bushing into placowithin'the piston.

plunger mounted in said yoke in alinement with the opening in the bed, and a detacliable head larger in diameter than the plunger and having. a diametrically reduced circular extremity adapted to be inserted with in a bushing, the opposite face of the-head being formed with a socket to receive the lower end of the plunger.

,3. A d comprising a bed' formed with a piston seat and having an opening extending through it, a yoke extending upward over the bed,

a plunger-mounted in the yoke for move ment toward and from thebed and disposed in alinement with the opening through the bed, an extension piece having a socket at of the character describedits upper end to engage the lower extremity of the plunger and being reduced in diameter ,at its lower end, and a head coaoting With the extension piece and having a reduced lower end adapted to fit within a bushing the upper face of the head being formed With a socket to receive the reduced end of the extension piece.

4. A device of the character described comprising a bed formed with a piston seat, a yoke arching over the bed and having a passage disposed over the center of the piston seat, a plunger movable through the passsage in the yoke and toward or from the bed, supporting members adapted to be (llS- posed within the piston, and means for eX-- panding said members against opposite portions of the piston wall.

5. A device (if the character described comprising a bed formed with a piston seat, a yoke arching over the bed and having a passage disposed over the center of the piston seat, a plunger movable through the passage in the yoke and toward or from the bed, supporting men'ib'ers adapted to be disposed withinthe piston, means for expand ing said members against opposite portions of the piston Wall, and a head having a socket in its upper face adapted to receive the lower end of the plunger, the iower end of the head being reduced and adapted to be inserted within the bushing.

6. Means for removing and replacing the bushings of wrist pins in hollow pistons, comprising a bed having a transversely eoncave piston seat, the under face of the bed being cut away and there being a passage from the under face to said seat, a yoke integral with the bed and arching over it and having a screw-threaded passage disposed in alinement with the opening through the bed, a sorew-threaded plunger engaging said pas sage and having a reduced lower end, a head ha ving a diameter larger than the diameter ol' the plunger and having a reduced lower end adapted to be insertcdwithin the bushing, and having a socket on its upper face, an extension piece having a diameter less than that of the head and reduced at its lower end to fit within the socket of the head, and having a socket at its upper end adapted to receive the lower end of the plunger, and means for holdinga piston against deformation. wh le a bushing is being inserted, comprising enactingblock sect-ions held from lateral movementwith relation to each' piston.

In testimony whereof l hereunto afi'ix my signature in the presence of two witnesses.

FRANK G. JGNES.

Witnessei HARVEY Jonas, h lnnennnr KEARNEY.- 

